Images answer “what is here?”

A single image is enough when the question is about a state: is the form complete, is the item damaged, which objects are present. Images are cheaper to store, label and process, and easier to review.

Video answers “what happened?”

Video adds time. It lets a system count repetitions, follow an object across frames, measure speed or range of motion, and notice events that only make sense in sequence.

  • Tracking links detections across frames so each object keeps an identity.
  • Sampling decides how many frames per second are worth processing.
  • Temporal logic turns per-frame results into events, such as one completed repetition.
ImageVideo
Best forStates and inspectionsMotion, counts and events
CostLowerHigher: more frames, more storage
ReviewOne frame per decisionClips and timelines
Typical outputLabels, boxes, fieldsTracks, counts, timings

Choosing between them

Start with images if the decision can be made from one moment. Move to video when the answer depends on movement or order, and budget for the extra compute, storage and review effort.

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